Miniature PWM Controller
for Buck Regulator
POWER MANAGEMENT
Description
The SC2618 is a hysteretic mode PWM controller de-
signed for high efficiency, low cost “Point of Load” appli-
cations.
The hysteretic control scheme allows the use of ceramic
output capacitors without the need for compensation
components and difficult calculations.
An internal soft start prevents output voltage from start
up overshoot. A “Hiccup” short circuit protection provides
protection against output short circuits as well as ad-
verse input supply sequencing.
SC2618
Features
Operating Frequency up to 500kHz
Input supply from 5V to 12V
0.5A gate drive capability
Internal soft start
Internal, trimmed bandgap reference (
±1%)
Hiccup mode short circuit protection
Input supply sequence protection
6 lead SOT23 package
Applications
Graphics IC Power supplies
Embedded, low cost, high efficiency converters
Typical Application Circuit
VIN
BOOST
VCC
Q1
VO
5
3
2
6
1
4
Q2
BST
VCC
GND
DH
DL
FB
SC2618
GND
GND
Revision: September 19, 2005
1
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